Backporting Python Versions

I have recently upgraded from Kirkstone to Scarthgap and due to
compatibility issues(arm32) I need an older version of Python to use an
older python package.
I have my preferred version set to the right version and I copied the old
Python recipe from the Kirkstone branch of openembedded-core.
When trying to build I get this error:
| if test $? -ne 0 ; then \
|       echo "generate-posix-vars failed" ; \
|       rm -f ./pybuilddir.txt ; \
|       exit 1 ; \
| fi
| /bin/sh: 1: python: not found
| generate-posix-vars failed
| make: *** [Makefile:614: pybuilddir.txt] Error 1
| ERROR: oe_runmake failed
| WARNING: exit code 1 from a shell command.

Attached is the full log.
I can see here that it's attempting to use python2 instead of python3 in
that generated file, but I'm not sure how to get it to generate it with
python3 instead.